|Publication number||US6868778 B2|
|Application number||US 09/952,647|
|Publication date||Mar 22, 2005|
|Filing date||Sep 14, 2001|
|Priority date||Sep 14, 2001|
|Also published as||US7455509, US20030051614, US20050201885|
|Publication number||09952647, 952647, US 6868778 B2, US 6868778B2, US-B2-6868778, US6868778 B2, US6868778B2|
|Inventors||Edward Arlen Knoth, Bhanu Chelluri, Edward John Schumaker|
|Original Assignee||Iap Research, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (51), Non-Patent Citations (14), Referenced by (11), Classifications (13), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This invention relates to the compacting of powder materials and more particularly to a system and method for loading a plurality of powder materials into a tool or die of an electromagnetic compaction process.
Several methods have been employed for forming particulate or powder-like materials in a unitary, firmly compacted body of material. Powder metal bodies have been formed by means of pressure and heat. U.S. Pat. Nos. 5,405,574; 5,611,139; 5,611,230; 6,156,264 and 6,188,304 all suggest systems and/or methods for compacting powder-like materials using electromagnetic compaction techniques.
The die and powder material would be placed in an electromagnetic compaction system and energized to form a densified powder part.
Unfortunately, it was difficult to arrange or situate a plurality of powder materials into a compaction tool or die in operative relationship with the armature. It was difficult to load or arrange a plurality of powder materials in the compaction tool or die so that they remain separate and distinct and do not mix.
What is needed, therefore, is a system and method for arranging and locating a plurality of powder or particulate materials in a magnetic compaction machine in order to provide a part having a plurality of densified materials.
It is a primary object of the invention to provide a system and method for loading a plurality of powder materials in a predetermined arrangement or order into an electromagnetic compaction system which will electromagnetically compact the materials to form a densified part comprising a plurality of densified, but distinct, materials.
In one aspect, this invention comprises a system for loading a plurality of powder materials into a magnetic compaction tool comprising a powder loader comprising a plurality of channels for channeling each of said plurality of powder materials into predetermined locations in the magnetic compaction tool so that when said tool is electromagnetically energized, said plurality of powder materials are compacted to form a part.
In another aspect, this invention comprises a magnetic compaction system comprising a magnetic compactor machine for energizing an armature to compact a plurality of materials to form a part; a compaction cassette; a powder loader comprising a plurality of channels for channeling each of said plurality of powder materials into a predetermined location in said compaction cassette; said compaction cassette being loaded into said compaction machine after said plurality of powder materials are loaded into said compaction cassette so that said plurality of powder materials is compacted to produce said part when said compaction machine energizes said compaction cassette.
In still another aspect of the invention, this invention comprises a method for magnetically compacting a plurality of powder materials to provide a part, said method comprising the steps of situating a powder loader and an armature on a tool from said tool; loading said plurality of powder materials in said powder loader; and energizing said armature to magnetically compact said plurality of powder materials to form the part.
Another object of the invention is to provide a system and method for utilizing a powder loader that melts during the compaction process to facilitate securing and retaining the powder materials in a desired configuration.
Another object of the invention is to provide a system and method which will reduce the time required for loading a plurality of materials into a die for forming a part.
Still another object of this invention is to provide a system and method for forming a predetermined characteristic in a finished part.
Another object of the invention is to provide a system and method for forming a plurality of apertures or voids in a part.
Still another object of the invention is to provide a system and method for making a permanent magnet stator for use in an electric motor.
Yet another object of the invention is to provide a system and method for guiding or channeling a plurality of powder materials into a predetermined position in an electromagnetic compaction tool.
Other objects and advantages of the invention will be apparent from the following description, the accompanying drawings and the appended claims.
Referring now to
In the embodiment being described, the die or tool of system 10 comprises at least one base or body member 34 (
The at least one member 36 is threadably received in the base 34, as illustrated in
It should be understood that the powder loader 12 provides the plurality of channels or apertures 18, 20, 26, 28 and 30 through which each of the plurality of powders 22, 24 and 25 are directed, channeled or guided into predetermined locations in the armature 32. The plurality of powder materials 22, 24 and 25 are thereafter compacted to form the part 40 when the armature 32, base 34 and cap 35 are electromagnetically energized. It should be appreciated that the techniques illustrated and described in U.S. Pat. Nos. 5,405,574, 5,611,139, 5,611,230, and 5,689,797 may be used to electromagnetically compact the part 42. These patents are incorporated herein by reference and made a part hereof.
The powder loader 12 is situated on the at least one member 36, as shown in
The powder loader 12 channels each of the plurality of materials 22, 24 and 25 into a predetermined area, such as areas 26, 30 and 28, respectively, as shown in
As best illustrated in
The body portion 16 also comprises the plurality of side apertures 16 a mentioned earlier. These apertures 16 a introduce the powder materials 25 into channel 28. As best illustrated in
After the materials 22, 24 and 25 are received in the armature 32, as illustrated in
Thus, the powder loader 12 facilitates loading a plurality of powder materials 22, 24 and 25 in a predetermined configuration into a die, tool, base or armature 32 to provide a loaded armature 32, as illustrated in FIG. 4. Once loaded with the powders 22, 24 and 25, the top member 35 may be threadably mounted on at least one member 36. This assembly may then be placed in a conventional magnetic compaction press such as the Magnapress® System offered by IAP Research, Inc. of Dayton, Ohio, so that the armature 32 can be energized to an appropriate level to provide the finished part (illustrated in FIG. 5).
It should be appreciated that one or more of the plurality of powders 22, 24 or 25 may be a void powder for defining at least one void or aperture, such as apertures, channels, areas or voids 62 in the finished part 42. In the illustration described herein, the void powder 24 may be a spherical steel, spherical iron or other incompressible powders, salt or cornstarch. After the armature 32 is energized and the powders 22, 24 and 25 are compacted, the at least one body portion 36 by the armature 32, the powders 22, 24 and 25 are removed from the at least one member 36 and base 34 after compaction.
It should be appreciated that at least one body portion 36 not only provides a platen for armature 32, but also facilitates aligning the powder loader 12 in the armature 32 so that the plurality of powder materials 22, 24 and 25 may be filled into the armature 32 as desired.
The powder loader 12 or the body portion 16 may be made or comprised of a resin that melts during the magnetic compaction process and facilitates binding the plurality of powder materials 22, 24 and 25 to form the part 42. The resin powder loader 12 is not removed from armature 32 in this embodiment. Thus, this embodiment also eliminates the need of having to remove the body portion 16 from the armature 32. It should also be appreciated that the armature 32 could comprise different shapes and sizes, and while it is shown in the embodiments of
After the powders are loaded in operative relationship with the armature 32, the assembly of the base 34, armature 32 and top member 35 are situated in a magnetic compaction machine, such as the Magnapress® System available from IAP Research, Inc. of Dayton, Ohio after the powders 22, 24 and 25 are situated in operative relationship between the armature 32 and the at least one member 36. The armature 32 and powders 22, 24 and 25 are then electromagnetically compacted. Thereafter, the compacted and densified materials 22 and 25 form the part 42, which in the embodiment being illustrated is a stator for use in an electric motor (not shown). As described earlier herein, the at least one member 36 defines the aperture 40 which receives a rotor (not shown) for use in an electric motor. In the embodiment being described, the armature 32 may form an integral component, such as an outer shell, of the finished part 42, but the armature 32 could be removed from the part 42 and discarded or recycled if desired.
It should be appreciated that the platen or at least one member 36 against which the armature 32 compacts the powders 22, 24 and 25 may be shaped to provide or define a predetermined characteristic in the part 42.
As with the powder loader 12 of the embodiment described earlier herein, the powder loader 12′ guides each of the powders 22′, 24′ and 25′ into a desired or predetermined area within the armature 32′ so that after compaction, the part 42′ comprises a plurality of distinct, compacted and densified materials 42 b′ and 42 c′. Also, by using the void powder material 24′ during the compaction process, the plurality of voids 62′ may be defined in the part 42′ after the powder 24′ is removed from the part after compaction. Thus, as illustrated in
A method for magnetically compacting a plurality of powders to provide the part 42 will now be described relative to FIG. 12.
The method begins at block 70 and the powder loader 12 is selected. At this step, it may be desired to select a powder loader 12 made of a resin material that melts during the compaction process to facilitate densifying the powders 22 and 25. At block 72, the powder loader 12 is situated into the die or tool in operative relationship with the armature 32. At block 74, the plurality of powder materials 22, 24 and 25 are selected. At decision block 76, it is determined whether a void powder 24 is desired to be used and if it is, the void powder 25 is selected at block 78. As mentioned earlier, the void powder 24 will cause one or more voids, such as voids 62 in
The powder loader 12 is then removed from the tool or die as illustrated in
Thereafter or if the decision at decision block 88 is negative, the top 60 is threadably secured to the at least one member 36 (block 92) and the assembly is situated in the electromagnetic compacting machine (block 94). The armature 32 is electromagnetically energized (block 96). The die or tool containing the compacted part 42 is removed from the compacting machine (block 98). As mentioned previously, the magnetic compaction system may be of the type shown and described in U.S. Pat. No. 5,611,139, which is incorporated herein by reference and made a part hereof.
In the embodiment being described, the armature 32 becomes an integral component of the part 42, but it can be removed if desired. At decision block 100, it is determined whether it is desired to remove the armature 32, and if it is, then the armature 32 is removed at block 102. Thereafter, or if the decision at decision block 100 is negative, then part 42 is finished.
Advantageously, this system and method provides means for electromagnetically compacting a plurality of powder materials to form a part 42 having a plurality of distinct and densified materials. This part 42 may be a stator for use in an electrical motor (not shown) that has a plurality of powder materials which have been identified in accordance with the system and method described herein. Note that the finished part 42 may also comprise a plurality of voids 62 or desired channels or apertures formed by the at least one member 36 or by a void powder 24 which is removed after the part 42 is compacted and densified.
The powder loader 12 has been shown and described as providing a plurality of channels 26, 28 and 30 for guiding the plurality of powder materials 22, 25 and 24, respectively, into the predetermined configuration in the die or tool and in operative relationship with the armature 32. It should also be appreciated, however, that other channels or channeling arrangements may be provided so that the plurality of powder materials 22, 24 and 25 are arranged or situated in the armature 32 in another desired or predetermined configuration. Also, the powder loader 12 or at least the base portion 16 of the powder loader 12 may be at least partially formed of a bonding material, such as resin or even another powder, that becomes an integral component of the finished part 42, so that the powder loader 12 or the body portion 16 does not have to be removed after the plurality of powder materials 22, 24 and 25 are loaded into the tool or die.
While the system and method herein described, and the form of apparatus for carrying this method into effect, constitute preferred embodiments of this invention, it is to be understood that the invention is not limited to this precise method and form of apparatus, and that changes may be made in either without departing from the scope of the invention, which is defined in the appended claims.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US929687 *||Jul 13, 1908||Aug 3, 1909||Duplex Metals Company||Clad metal and process of producing the same.|
|US2966704||Jan 22, 1957||Jan 3, 1961||Edward D O'brian||Process of making a ferrite magnetic device|
|US2976907||Aug 28, 1958||Mar 28, 1961||Gen Dynamics Corp||Metal forming device and method|
|US3346914||Nov 10, 1966||Oct 17, 1967||Donald J Sandstrom||Device for consolidating metal powders|
|US3347074||Dec 21, 1964||Oct 17, 1967||Gen Motors Corp||Electromagnetic forming apparatus and method|
|US3414940 *||Apr 21, 1966||Dec 10, 1968||Pentronix Inc||Tool capsule for powder compacting press|
|US3640654 *||Jun 25, 1970||Feb 8, 1972||Wolverine Pentronix||Die and punch assembly for compacting powder and method of assembly|
|US3838488||Oct 16, 1973||Oct 1, 1974||Sumitomo Electric Industries||Apparatus for manufacturing fine metallic filaments|
|US3892506 *||Jun 28, 1973||Jul 1, 1975||Fred M Dann||Projection forming of three-dimensional metal objects|
|US4130926||Feb 17, 1977||Dec 26, 1978||Ceraver S.A.||Method of producing a rod anchoring structure|
|US4147489 *||Aug 9, 1977||Apr 3, 1979||British Nuclear Fuels Ltd.||Powder compacting presses|
|US4170887||Aug 10, 1977||Oct 16, 1979||Kharkovsky Politekhnichesky Institut||Inductor for working metals by pressure of pulsating magnetic field|
|US4260346 *||Oct 9, 1979||Apr 7, 1981||Anderson Jr Raymond B||Press assembly for powder material|
|US4261092||Sep 20, 1979||Apr 14, 1981||Chrysler Corporation||Method of electroforming a metallic sleeve and ceramic shaft joint|
|US4297388||Apr 8, 1980||Oct 27, 1981||The Charles Stark Draper Laboratory, Inc.||Process of making permanent magnets|
|US4298563 *||Jun 27, 1980||Nov 3, 1981||Ptx-Pentronix, Inc.||Apparatus and method for compacting prismatic or pyramidal articles from powder material|
|US4352648 *||Dec 22, 1980||Oct 5, 1982||Toolmakers, Incorporated||Powdered metal press and tooling therefor|
|US4380473||Jan 24, 1980||Apr 19, 1983||Glacier Gmbh-Deva Werke||Apparatus for the continuous extrusion of electrically conductive granulated materials, preferably powder metallurgy materials|
|US4592889||Mar 21, 1985||Jun 3, 1986||The United States Of America As Represented By The Secretary Of The Army||Method and apparatus for the pressing and alignment of radially oriented toroidal magnets|
|US4696100||Jun 30, 1986||Sep 29, 1987||Matsushita Electric Industrial Co., Ltd.||Method of manufacturing a chip coil|
|US4717627||Dec 4, 1986||Jan 5, 1988||The United States Of America As Represented By The United States Department Of Energy||Dynamic high pressure process for fabricating superconducting and permanent magnetic materials|
|US4762754||Oct 23, 1987||Aug 9, 1988||The United States Of America As Represented By The United States Department Of Energy||Dynamic high pressure process for fabricating superconducting and permanent magnetic materials|
|US4853180 *||Sep 15, 1988||Aug 1, 1989||Martin Sprocket & Gear, Inc.||Method of manufacturing bushings with powdered metals|
|US4929415||Mar 1, 1988||May 29, 1990||Kenji Okazaki||Method of sintering powder|
|US4939121||Oct 20, 1988||Jul 3, 1990||General Dynamics Corporation, Electronics Division||Method and apparatus for inducing grain orientation by magnetic and electric field ordering during bulk superconductor synthesis|
|US4962656||Jun 30, 1989||Oct 16, 1990||The United States Of America As Represented By The United States Department Of Energy||Control and monitoring method and system for electromagnetic forming process|
|US5004722||Jan 19, 1989||Apr 2, 1991||International Superconductor Corp.||Method of making superconductor wires by hot isostatic pressing after bending|
|US5030614||Sep 5, 1989||Jul 9, 1991||Omega Engineering, Inc.||Superconductor sensors|
|US5057486||Mar 5, 1990||Oct 15, 1991||General Electric Company||Synthesis of bi-pb-ca-sr-cu-o oriented polycrystal superconductor|
|US5079225||Mar 12, 1990||Jan 7, 1992||Aleksey Holloway||Process and apparatus for preparing textured crystalline materials using anisotropy in the paramagnetic susceptibility|
|US5084088||Oct 9, 1990||Jan 28, 1992||University Of Kentucky Research Foundation||High temperature alloys synthesis by electro-discharge compaction|
|US5096880||Apr 20, 1990||Mar 17, 1992||General Dynamics Corp./Electronics Division||Method and apparatus for inducing grain orientation by magnetic and electric field ordering during bulk superconductor synthesis|
|US5101560||Aug 6, 1990||Apr 7, 1992||The United States Of America As Represented By The Secretary Of The Air Force||Method for making an anisotropic heat pipe and wick|
|US5162296||Jun 8, 1990||Nov 10, 1992||Semiconductor Energy Laboratory Co., Ltd.||Plasma-enhanced CVD of oxide superconducting films by utilizing a magnetic field|
|US5169572||Jan 10, 1991||Dec 8, 1992||Matthews M Dean||Densification of powder compacts by fast pulse heating under pressure|
|US5214840||Jul 10, 1990||Jun 1, 1993||Hitachi, Ltd.||Thin film magnetic head and the method of fabricating the same|
|US5236021 *||Dec 23, 1991||Aug 17, 1993||General Electric Company||Powder filling apparatus|
|US5250255||Dec 2, 1991||Oct 5, 1993||Intermetallics Co., Ltd.||Method for producing permanent magnet and sintered compact and production apparatus for making green compacts|
|US5262396||May 13, 1992||Nov 16, 1993||Semiconductor Energy Laboratory Co., Ltd.||Plasma-enhanced CVD of oxide superconducting films by utilizing a magnetic field|
|US5405574||Feb 10, 1992||Apr 11, 1995||Iap Research, Inc.||Method for compaction of powder-like materials|
|US5427514 *||Feb 24, 1994||Jun 27, 1995||Yazaki Corporation||Magnetic plastic rotor disk manufacturing apparatus|
|US5503686||Mar 13, 1995||Apr 2, 1996||Fuji Electric Co., Ltd.||Heat treatment method for thin film magnetic head|
|US5611139||Apr 6, 1995||Mar 18, 1997||Iap Research, Inc.||Structure and method for compaction of powder-like materials|
|US5611230||Jan 3, 1995||Mar 18, 1997||Iap Research, Inc.||Structure and method for compaction of powder-like materials|
|US5689797||Apr 6, 1995||Nov 18, 1997||Iap Research, Inc.||Structure and method for compaction of powder-like materials|
|US6136265||Aug 9, 1999||Oct 24, 2000||Delphi Technologies Inc.||Powder metallurgy method and articles formed thereby|
|US6156264||Oct 6, 1999||Dec 5, 2000||Delphi Technologies, Inc.||Electromagnetic compacting of powder metal for ignition core application|
|US6241935 *||Mar 30, 1999||Jun 5, 2001||Materials Innovation, Inc.||Pulsed pressurized powder feed system and method for uniform particulate material delivery|
|US6273963||Jul 29, 1996||Aug 14, 2001||Iap Research, Inc.||Structure and method for compaction of powder-like materials|
|DE975730C||Jul 4, 1951||Jul 5, 1962||Siemens Ag||Verfahren zur Herstellung eines magnetischen Massekernes fuer Hochfrequenzspulen|
|WO1998006525A2||Jun 19, 1997||Feb 19, 1998||Iap Research, Inc.||Compaction of powders by energized solenoid|
|1||"Kinetics of Magnetic Pulse Pressing of Iron Powder," Soviet Powder Metallurgy and Metal Ceramics, vol. 13, No. 9, 1975, pp. 709-711 XP002144651.|
|2||Balachandran et al., "Hot Extrusion of High-Temperature Superconducting Oxides," American Ceramics Bulletin, p. 813, May 1991.|
|3||Bennett, "Electromagnetic Forming," Pulsed Power Lecture Series, Lecture No. 36 by J. Bennett and M. Plum.|
|4||Chelluri et al., Powders, Specialty Materials and Composites Advances in Particulate Materials, Metal Powder Industries Federation: Princeton, N.J., vol. 5, pp. 219-226, 1994.|
|5||Heine et al., "High-Field Critical Current Densities," 1989 Applied Physics Letters, p. 2441.|
|6||Jin et al., "Melt-Textured Growth of Polycrystaline," Physical Review B, vol. 37, No. 13, May 1, 1988.|
|7||Lennon et al., "Explosive Compaction of Metal Powders", Powder Metallurgy, 1978, No. 1.|
|8||Marcus et al., "High-Energy, High-Rate Materials Processing," Journal of Metals, pp. 6-10, Dec. 1987.|
|9||Mironov, German publication entitled, Planseeberichte Fur Pulvermetallurgie, Pulverdichten mit Magnetimpulsen, pp. 175-190, 1976.(With Translation).|
|10||Murr, "Metal Matrix High-Temperature Superconductor," Metal Progress, Advanced Materials and Processes, Inc., p. 37, Oct. 1987.|
|11||Parsad et al., "Composite Solid Armature Consolidation by Pulse Power Processing: A Novel Homopolar Generator Application in EML Technology," Transactions on Magnetics, vol. 25, No. 1, pp. 429-432, Jan. 1989.|
|12||Seaman, "Crystallographically Oriented Superconducting bi2Sr2CaCu2O8 by Shock Compaction of Prealigned Powder," Applied Physics Letters 57, p. 93, Jul. 2, 1990.|
|13||Town, "Densification of Yba2CuO7 8 by Uniaxial Pressure Sintering," Cryogenics, vol. 30, May 1990.|
|14||U.S. Statutory Invention Registration No. H120, issued to Corwin, published on Sep. 2, 1986, for Method of Electroforming a Ceramic Faced Workpiece.|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US7395597 *||Feb 18, 2005||Jul 8, 2008||Edison Welding Institute Inc||Opposed current flow magnetic pulse forming and joining system|
|US7913369 *||Mar 29, 2011||Blue Sky Vision Partners, Llc||Ceramic center pin for compaction tooling and method for making same|
|US7981359 *||Dec 7, 2004||Jul 19, 2011||Hitachi Metals, Ltd.||Rotor and process for manufacturing the same|
|US8312612 *||Nov 20, 2012||Blue Sky Vision Partners, Llc||Refurbished punch tip and method for manufacture and refurbishing|
|US8508092||Nov 19, 2010||Aug 13, 2013||Toyota Motor Engineering & Manufacturing North America, Inc.||Permanent magnet rotors and methods of manufacturing the same|
|US9272332||Sep 27, 2012||Mar 1, 2016||GM Global Technology Operations LLC||Near net shape manufacturing of rare earth permanent magnets|
|US20060170301 *||Dec 7, 2004||Aug 3, 2006||Masahiro Masuzawa||Rotor and process for manufacturing the same|
|US20060185412 *||Feb 18, 2005||Aug 24, 2006||Edison Welding Institute||Opposed current flow magnetic pulse forming and joining system|
|US20060193937 *||Apr 21, 2006||Aug 31, 2006||Luka Gakovic||Ceramic center pin for compaction tooling and method for making same|
|US20070269334 *||Jan 17, 2007||Nov 22, 2007||Roger Lawcock||Multiple part compaction|
|US20100239698 *||Jun 9, 2010||Sep 23, 2010||Luka Gakovic||Refurbished punch tip and method for manufacture and refurbishing|
|U.S. Classification||100/214, 425/3, 425/352, 425/130, 425/78, 100/917|
|International Classification||B30B1/42, B30B15/30|
|Cooperative Classification||B30B15/306, Y10S100/917, B30B1/42|
|European Classification||B30B1/42, B30B15/30B|
|Jan 18, 2002||AS||Assignment|
Owner name: IAP RESEARCH, INC., OHIO
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KNOTH, EDWARD ALLEN;CHELLURI, BHANU;SCHUMAKER, EDWARD JOHN;REEL/FRAME:012538/0205
Effective date: 20010906
|Jul 31, 2002||AS||Assignment|
Owner name: IAP RESEARCH, INC., OHIO
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KNOTH, EDWARD ARLEN;CHELLURI, BHANU;SCHUMAKER, EDWARD JOHN;REEL/FRAME:013140/0301
Effective date: 20010906
|Aug 6, 2008||FPAY||Fee payment|
Year of fee payment: 4
|May 3, 2012||FPAY||Fee payment|
Year of fee payment: 8